Re-tread paver



mun

W. A. COST RE-TREAD PAVER Filed NOV. 9, 1934 May 3, 1938.

r a a n m. M

W. A. COST RE-TREAD PAVER May 3, 1938.

Filed Nov. 9, 1934 2 Sheets-Sheet 2 Patented May 3, 1938 PATENT OFFICE RE-TREAD PAVER William A. Cost, Indianapolis, Ind., assignor to J. D. Adams Manufacturing Compa y. Indianapolis, Ind., a corporation of Indiana Application November 9, 1934, Serial No. 752,230

15 Claims.

This invention relates to re-tread pavers and especially those of the type adapted to be drawn along a road by a tractor or other vehicle. Such machines operate to mix and distribute a paving composition to the desired cross-section on a road surface.

Among the objects of my invention are to provide means controlling the width of the sheet of paving material which the machine distributes and to provide for a more accurately controlled disposition of that sheet of paving material laterally of the roadway.

In carrying out my invention I provide a longitudinally extending main frame adjustably supported from a front truck and provided at its rear end with supporting wheels which have a steering adjustment and which are also vertically adjustable relative to the main frame. The

' main frame carries a series of oppositely oblique mixing blades which operate to pass the paving composition back and forth across the road surface as the machine is moved. At the rear of the machine I provide a transversely extending distributing blade which is vertically adjustable relative to the main frame in order to control the cross-section of the sheet in which the paving material is distributed. Near the ends of the distributing blade, I provide it with forwardly extending wings which serve to confine the paving material laterally, and I make these wings adjustable along the face of the blade in order to regulate the width of the sheet of paving material.

The accompanying drawings illustrate my invention: Fig. 1 is a top plan view of the complete machine; Fig. 2 is a side elevation of the complete machine with parts thereof broken away; Fig. 3 is a vertical section on the line 3-3 of Fig. 4; Fig. 4 is a vertical transverse section taken in a plane immediately ahead of the rear wheels showing details of the rearewheel mounting; and Fig. 5 is a fragmental transverse section on the line 5-5 of Fig. 1.

The machine illustrated embodies a generally rectangular main frame Hi to an intermediate point of which there is pivoted on a transverse axis a V-shaped rigid draw bar ll supported at its front end on a wheeled truck l2, such truck having a tongue l3 for attachment to the vehicle which is to draw the paver along the road. Mounted on the draw bar I I is a transverse rock shaft 15 having rigid crank-arms it connected by links H to the front end of the main frame Hi. It will be obvious that by angularly adjusting the shaft IS the front end of the main frame can be raised and lowered. For the purpose of effecting this adjustment, the shaft l5 has associated with it irreversible power-transmission -mechanism such as worm gearing located in a suitable casing l8 and preferably arranged to be operated from the rear of the machine through the medium of a flexible and extensible shaft I9.

Secured to the lower side of the main frame are a plurality of mixing blades. These comprise a pair of rearwardly converging blades 2| at the front of the main frame, a pair of rearwardly 10 diverging blades 22 positioned to receive material passing between the inner ends of the blades 2|, and a second pair of rearwardly converging blades 23 adapted to receive and move inwardly material discharged from the outer ends of the blades 22. Better to confine the material upon which the machine acts, each of the inwardly and rearwardly inclined blades may be provided at its outer end with a forwardly extending wing 24. In embodying my invention with those parts of the machine so far described, I provide a rear truck for supporting the rear end of the main frame II]. This truck comprises a laterally extending cross member 30, preferably tubular in cross-section, to the ends of which are secured hollow legs 3|. These legs extend downwardly from the cross member outside the side members of the main frame ill and are provided interiorly with bearings for the support respectively of pivots 32 having at their lower ends spindles 30 33 upon which rear wheels 34 are mounted.- The pivots 32 extend upwardly beyond the upper ends of the legs 3|, and secured to their upper ends are arms 36 interconnected by a tie rod 31 by means of which joint steering movement of the 35 wheels is effected. One of the pivots 32 extends upwardly beyond its associated arm 36 into association with irreversible power-transmission mechanism such as worm gearing located within a suitable housing 38 mounted on the rear truck 40 and adapted to be operated by a flexible and extensible shaft 39 from the rear of the machine. To provide for the vertical adjustment of the rear end of the main frame ill, the rear truck is connected to the main frame by two pairs of 5 parallel links located at opposite sides of the machine. Each of these pairs of links comprise an upper link 4| and a lower link 42, the rear ends of such links being pivotally connected at vertically spaced points to a web 43 rigid with the adjacent leg 3| of the rear truck. The front end of each of the lower links 42 is pivoted on an ear 44 secured to the main frame III, while the front ends of the upper links 4| are rigidly secured to a transversely extending rock shaft 46 supported in suitable bearings on the main frame. Irreversible power-transmission mechanism in 8. casing 41 mounted on the main frame is associated with the shaft 46 and is adapted to be controlled by an operating shaft 48.

From the above description, it will be obvious that by operation of the gearing in the casing 41 the shaft 46 may be rocked about its axis and the rear end of the main frame adjusted verti- 'cally. To aid in raising the main frame, counterbalancing springs 50 may be provided, each of such springs extending between a fixed point on the main frame and the outer end of an arm secured to the shaft 46.

For the purpose of distributing material discharged from the rear ends of the blades 23, I provide a distributing blade 60 located at the extreme rear end of the machine. This blade is movably connected to the main frame IQ for vertical adjustment by means of two pairs of parallel links located at opposite sides of the machine. Each pair of these links comprise an upper link 6! and a lower link 62, the front ends of such links being pivotally secured in vertically spaced relation to a bracket 63 on the main frame and the rear ends being pivotally secured to a bracket 64 secured to the rear face of the blade 60. The lower link 63 is arched to permit it to clear the upper edge of the blade 60.

Adjusting mechanism for controlling the vertical disposition of the distributing blade 60 conveniently comprises two sets of worm gearing located in casings mounted at the rear of the main frame and operable to control the angular disposition of two swinging arms H. The free ends of the arms H are connected by links I! to the distributing blade 60.

To prevent the paving material from accumulating to too great an extent near the center of the distributing blade, the center of such blade is preferably displaced forwardly to provide two forwardly converging portions 60' which meet near the longitudinal center of the machine. As it may be desired to distribute more of the paving material to one end of the blade than to the other, I prefer to mount in advance of the distributing blade a horizontally swingable vertical vane I5 the angular position of which is controlled by irreversible gearing located in a suitable casing 16 which is mounted on the distributing blade.

I prefer to provide at the ends of the distributing blade 60 forwardly extending wings 80 and to make these wings adjustable laterally of the machine. For this purpose I mount above and in advance of each end of the distributing blade 60 a horizontal rod 8| which is slidably received in an ear 82 extending upwardly from the ad jacent wing 80. Secured to each of the wings 80 near the rear end thereof is a bracket 83 having a hole for the reception of a bolt 84 which may also pass through any of a series of holes 85 in the distributing blade 60.

For the purpose of effecting the necessary adjustments, two operators will ordinarily be required, such operators being preferably located at the rear end of the machine where the operation of the machine will be visible to them. At the operators stations I provide seats 90 and 9|, the former being located near the center of the machine and the latter at one side. The shafts I9, 39, and 48, which control respectively the height of the front end of the main frame, the steering of the rear wheels, and the height of the rear end of the main frame conveniently extend the position of the vane 15, are provided with operating shafts II and It respectively extending to points adjacent the seat 90 where they are equipped with suitable hand wheels by means of which an operator in the seat 90 can regulate the distributing blade and the vane "I5 to spread the paving material in a sheet of the desired cross section.

As the machine is drawn along the road by any suitable vehicle hitched to the tongue I3, the paving composition, which has previously been distributed on the road surface, is gathered and moved inwardly by the front blades 2|. As it leaves the blades 2|, the material is engaged by the second set of blades 22, which operate to move it outwardly. The rear set of mixing blades 23 receive the material discharged from the blades 22 and again moves it inwardly to be discharged rearwardly near the center of the machine, This working of the material back and forth across the roadway serves to mix it thoroughly.

The paving material discharged from the mixing blades is engaged by the distributing blade which operates to distribute it in a sheet of the desired cross-section the width of which is efi'ectively determined by the respective positions of the wings 80.

The operator of the draft vehicle will cause it to followa course such that the previously placed windrow of paving material will be received beblades 2|. The lateral position on the roadway of the rear end of the machine is under the control of the operator in the seat 9], who steers the rear wheels to control the lateral disposition of the sheet of paving material laid by the distributing blade.

It may sometimes be desired to effect independent vertical adjustment of the two rear wheels 34. To accomplish this result, I may provide one of the rear wheel pivots 32 with a certain amount of vertical sliding'motion in its associated leg SI of the rear truck, and I may control the vertical disposition of the pivot by means of a screw 05 which is mounted in a yoke 96 secured to the cross member of the rear truck and which bears against the upper end of the pivot 32, the weight of the main frame and the parts it carries serving to hold the screw in engagement with the upper end of the pivot.

I claim as my invention:

1. A re-tread paver, comprising a frame, a. plurality of oppositely oblique mixing blades mounted on said frame, a wheeled support for the front end of said frame, said wheeled support being mounted for swinging movement about a vertical axis relative to said frame, a pair of steerable rear supporting wheels for said frame, a distributing blade extending generally transversely of said frame in rear of said mixing blades, a forwardly extending wing at each end of said distributing blade, and means for holding each of ;said wings in any the various positions of transtween the forward ends of the first set of mixing mounted near each end of said distributing blade parallel to the face thereof, a support secured to each of said wings and having an opening for slidably receiving said guide rod, and means for holding each of said wingsin any of various positions of adjustment along said guide rod.

3. In a re-tread paver having a frame, a plurality of oblique mixing blades, and a distributing blade located in rear of said mixing blades, a support for the end of said frame, said support comprising two ground-engaging wheels located at the sides of said frame, spindles upon which said wheels are mounted, a bearing in which each of said spindles is mounted for rotation about a generally vertical axis, means for adjusting said spindles about their respective axes, and adjustable means interconnecting said frame and said bearings for relative vertical movement.

4. The invention set forth in claim 3, with the addition of means for adjusting one of said spindles axially in its associated bearing.

5. In a re-tread paver, a generally transverse distributor blade located near the rear thereof, steerable ground-engaging wheels located near the rear of thepaver, an operator's station disposed at one side of the paver over the adjacent end of the distributing blade, a rotatable steering control member located at said operators station, and irreversible power-transmission mechanism operatively interconnecting said control member and said wheels.

6. In a re-tread paver, a frame, a wheel spindie, a wheel mounted thereon, a bearing in which said spindle is pivotally mounted on a vertical axis, steering mechanism for adjusting said spindle in said bearing, and means supporting said bearing for vertical adjustment relative to the frame, said means comprising a transverse rockshaft on said frame, an arm rigid with said rockshaft and having its outer end pivotally connected to said bearing, a link substantially equal in length to said arm, said link extending parallel to said arm and having its ends connected respectively to said frame and said bearing. and means for adjusting said rock-shaft about its axis.

7. In a re-tread paver, a frame, a wheel spindle, a wheel mounted thereon, a bearing in which said spindle is pivotally mounted on a vertical axis, steering mechanism for adjusting said spindle in said bearing, and means supporting said bearing for vertical adjustment relative to the frame.

8. In a machine of the type described, a bladecarrying frame, a wheel-spindle bearing, means for adjusting said bearing vertically relative to said frame, a wheel-spindle mounted in said bearing for angular adjustment about a vertical axis, means for so adjusting said spindle, and a ground-engaging wheel mounted on said spindle for rotation about a horizontal axis.

9. In a machine of the type described, a bladecarrying frame, a pair of wheel-spindle bearings disposed respectively at opposite sides of said frame, common means for adjusting said bearings vertically as a unit relative to said frame, a wheel-spindle mounted in each of said bearings for angular adjustment about a vertical axis,

common means for so adjusting said spindles simultaneously, and ground-engaging wheels mounted on said spindle respectively for rotation about horizontal axes.

10. The invention set forth in claim 9 with th addition that one of said spindles is axially adjustable in its associated bearing, and means for so adjusting such spindle.

11. The invention set forth in claim 8 with the addition of means for adjusting said wheel-spindle axially in its associated bearing.

12. In a machine of the type described, a frame carrying a plurality of mixing blades and a distributing blade located in rear of said mixing blade, a pair of frame-supporting wheels disposed between said distributing blade and the rearmost of said mixing blades, and means carried by said frame for simultaneously adjusting said wheels about vertical axis, said means including an operating member located approximately over one end of said distributing blade and connections between said operating member and said wheels.

13. A re-tread paver, comprising a frame, a plurality of oppositely oblique mixing blades mounted on said frame, a wheeled support for the front end of said frame, said wheeled support being mounted for swinging movement about a vertical axis relative to said frame, a pair of steerable rear supporting wheels for said frame, adjustable means interconnecting said frame and rear wheels for relatively vertical movement, a distributing blade extending generally transverselyof said frame in rear of said mixing blades, a steering control member rotatably supported from said frame, and irreversible powertransmission mechanism operatively interconnecting said member and said wheels.

14. In a re-tread paver, a frame, a generally transverse distributing blade located near the rear of said frame, a wheeled support for the front end of said frame, said support being mounted for swinging movement about a vertical axis, steerable ground-engaging wheels supporting the rear end of said frame, a rotatable steering control member, and irreversible powertransmission control mechanism operatively interconnecting said member and said steerable wheels.

15. A re-tread paver, comprising an elongated frame, a wheeled support for the front end of said frame, said support being mounted for swinging movement about a vertical axis relative to said frame, steerable rear wheels supporting the rear end of said frame, a rotatable steering control member supported from said frame, irreversible power-transmission mechanism operatively interconnecting said member and said rear wheels, a pair of rearwardly converging gathering blades mounted near the front of said frame, a series of oppositely oblique mixing blades disposed in rear of said gathering blades, a distributing blade mounted for vertical adjustment on said frame in rear of said rear wheels, and means for confining laterally loose paving material on the face of said distributing blade.

WILLIAM A. COST. 

